Analysis of Buzz in a Supersonic Inlet
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Analysis of Buzz in a Supersonic Inlet

Analysis of Buzz in a Supersonic Inlet


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About the Book

A dual-stream, low-boom supersonic inlet designed for use on a small, Mach 1.6 aircraft was tested experimentally in the 8- by 6-Foot Supersonic Wind Tunnel (SWT) at the NASA Glenn Research Center (GRC). The tests showed that the inlet had good recovery and stable operation over large mass flow range. The inlet went into buzz at mass flows well below that needed for engine operation, and the experiments generated a wealth of data during buzz. High frequency response pressure measurements and high-speed schlieren videos were recorded for many buzz events. The objective of the present work was to use computational fluid dynamics (CFD) to predict some of the experimental data taken during buzz, compare those predictions to the experimental data, and to use both datasets to explain the physics of the buzz cycle. The calculations were done with the Wind-US CFD code using a second-order time-accurate differencing scheme and the SST turbulence model. Computed Mach number contours were compared with schlieren images, and ensemble-averaged unsteady pressures were compared to data. The results showed that the buzz cycle consisted partly of spike buzz, an unsteady oscillation of the main shock at the spike tip while the inlet pressure dropped, and partly of choked flow while the inlet repressurized. Most of the results could be explained by theory proposed by Dailey in 1954, but did not support commonly used acoustic resonance explanations. Chima, Rodrick V. Glenn Research Center COMPUTATIONAL FLUID DYNAMICS; SUPERSONIC WIND TUNNELS; ACOUSTIC RESONANCE; FREQUENCY RESPONSE; HIGH FREQUENCIES; MACH NUMBER; INLET PRESSURE; SUPERSONIC SPEED; OSCILLATIONS; PRESSURE MEASUREMENT; TURBULENCE MODELS


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Product Details
  • ISBN-13: 9781719389518
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1719389519
  • Publisher Date: 22 May 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 118 gr


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